From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] helo=mx.sourceforge.net) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1YrmCw-0006AU-Kp for bitcoin-development@lists.sourceforge.net; Mon, 11 May 2015 11:49:14 +0000 Received-SPF: softfail (sog-mx-2.v43.ch3.sourceforge.com: transitioning domain of hashingit.com does not designate 89.145.69.228 as permitted sender) client-ip=89.145.69.228; envelope-from=dave@hashingit.com; helo=heron.directrouter.co.uk; Received: from heron.directrouter.co.uk ([89.145.69.228]) by sog-mx-2.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1YrmCu-0001x4-OI for bitcoin-development@lists.sourceforge.net; Mon, 11 May 2015 11:49:14 +0000 Received: from host109-155-54-156.range109-155.btcentralplus.com ([109.155.54.156]:55488 helo=[192.168.1.82]) by heron.directrouter.co.uk with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.85) (envelope-from ) id 1YrmCn-001wYZ-6J; Mon, 11 May 2015 11:49:05 +0000 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2098\)) From: Dave Hudson In-Reply-To: <66648462658adebb5e5be7fcba65e670@national.shitposting.agency> Date: Mon, 11 May 2015 12:49:03 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: References: <55505441.3010906@certimix.com> <20150511103402.GA21748@savin.petertodd.org> <66648462658adebb5e5be7fcba65e670@national.shitposting.agency> To: insecurity@national.shitposting.agency X-Mailer: Apple Mail (2.2098) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - heron.directrouter.co.uk X-AntiAbuse: Original Domain - lists.sourceforge.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - hashingit.com X-Get-Message-Sender-Via: heron.directrouter.co.uk: authenticated_id: dave@hashingit.com X-Source: X-Source-Args: X-Source-Dir: X-Spam-Score: 1.5 (+) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. 1.0 SPF_SOFTFAIL SPF: sender does not match SPF record (softfail) 0.5 AWL AWL: Adjusted score from AWL reputation of From: address X-Headers-End: 1YrmCu-0001x4-OI Cc: bitcoin-development@lists.sourceforge.net Subject: Re: [Bitcoin-development] Reducing the block rate instead of increasing the maximum block size X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 May 2015 11:49:14 -0000 > On 11 May 2015, at 12:10, insecurity@national.shitposting.agency = wrote: >=20 > On 2015-05-11 10:34, Peter Todd wrote: >> How do you see that blacklisting actually being done? >=20 > Same way ghash.io was banned from the network when used Finney attacks > against BetCoin Dice. >=20 > As Andreas Antonopoulos says, if any of the miners do anything bad, we > just ban them from mining. Any sort of attack like this only lasts 10 > minutes as a result. Stop worrying so much. This doesn't work because a large-scale miner can trivially make = themselves look like a very large number of much smaller scale miners. = Their ability to minimize variance comes from the cumulative totals they = control so 10 pools of 1% of the network cumulatively have the same = variance as 1 pool with 10% of the network. It's also very easy for = miners to relay blocks via different addresses and the cost is minimal. = The biggest cost would be in DDoS prevention and a miner that actually = split their pool into lots of small fragments would actually give = themselves the ability to do quite a lot of DDoS mitigation anyway. If = no-one is doing this right now it's simply because they've not had the = right incentives to make it worthwhile; if the incentives make it = worthwhile then this is pretty trivial to do. This is one area where anonymity on behalf of transaction validators and = block makers essentially makes it pretty-much impossible to maintain any = sort of sanctions against antisocial behaviour.=